The Saints coach believes that if the centre stays fit in 2016, then an England call-up cannot be far away.
“I thought ‘Percy’ might have got a call-up for the end of season Test series last year,” Cunningham told the St Helens Star.
“I could believe they didn’t give Percy a crack, or at least put him in the squad.
“Like all great players he sometimes doesn’t realise how good he is.
“Often is play is instinctive – and at times he probably doesn’t know what he has done – but he certainly possesses a good awareness of space.
“He has trained the house down in pre-season and is now bigger, stronger and quicker and I definitely think this is going to be a big year for him.”